JAVA二重循环输出

Question

利用二维数组,初始化6个学生,每个学生4门成绩;计算输 出: 每个学生的平均 成绩，每门课程班级所以人的平均成绩

Answer 1

import java.util.Arrays;

public class Main {

    public static void main(String[] args) {
        // 换成你的数据
        double[][] arr = {
                {80, 90, 85, 95},
                {70, 75, 80, 85},
                {90, 85, 80, 95},
                {85, 80, 75, 90},
                {95, 90, 85, 80},
                {80, 85, 90, 95}
        };

        System.out.println("每个学生均分如下:");
        for (int i = 0; i < arr.length; i++) {
            double sum = 0;
            for (int j = 0; j < arr[i].length; j++) {
                sum += arr[i][j];
            }
            double avg = sum / arr[i].length;
            System.out.printf("学生 %d: %.2f\n", i + 1, avg);
        }
        System.out.println("\n每门课程均分如下:");
        for (int j = 0; j < arr[0].length; j++) {
            double sum = 0;
            for (int i = 0; i < arr.length; i++) {
                sum += arr[i][j];
            }
            double avg = sum / arr.length;
            System.out.printf("课程 %d: %.2f\n", j + 1, avg);
        }
    }
}